Function lwp_ref_dec

components/lwp/lwp_pid.c:980–1011

* @brief Decrements the reference count of a lightweight process (LWP) * * @param[in,out] lwp The lightweight process whose reference count to decrement * * @return int The reference count before decrementing * * @note This function atomically decrements the LWP's reference count. * When the count reaches 1 (meaning this was the last reference): * - For debug builds, sends a me

 *       - Calls lwp_free() to release all LWP resources
 */
int lwp_ref_dec(struct rt_lwp *lwp)
{
    int ref;

    ref = rt_atomic_add(&lwp->ref, -1);
    LOG_D("%s(lwp=%p,lwp->cmd=%s): before ref=%d", __func__, lwp, lwp->cmd, ref);

    if (ref == 1)
    {
        struct rt_channel_msg msg;

        if (lwp->debug)
        {
            memset(&msg, 0, sizeof msg);
            rt_raw_channel_send(gdb_server_channel(), &msg);
        }

#ifndef ARCH_MM_MMU
#ifdef RT_LWP_USING_SHM
        lwp_shm_lwp_free(lwp);
#endif /* RT_LWP_USING_SHM */
#endif /* not defined ARCH_MM_MMU */
        lwp_free(lwp);
    }
    else
    {
        /* reference must be a positive integer */
        RT_ASSERT(ref > 1);
    }

    return ref;
}

/**
 * @brief Retrieves a lightweight process (LWP) by its PID while holding the lock